books.google.ca - Originally published: New York: Columbia University Press, 1916....https://books.google.ca/books/about/The_Book_of_the_Popes_Liber_Pontificalis.html?id=N1KMTRsvPGUC&utm_source=gb-gplus-shareThe Book of the Popes (Liber Pontificalis)

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Page 13 - The night mass at Christmas is still a feature of the Roman ritual. The author of the Lib. Pont, is the earliest writer to allude to it. It can hardly have been instituted before the date of the Nativity was fixed during the fourth century.

Page 3 - harge the appointing of such persons as may determine such ecclesiastical causes as may arise ; that thou thyself mayest not be taken up with worldly cares, but mayest apply thy whole studies only to prayer, and preaching to the people.